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from kamaki.cli.config import Config

from kamaki.cli.errors import CLISyntaxError, raiseCLIError

from kamaki.cli.utils import split_input

from datetime import datetime as dtm

from time import mktime

from logging import getLogger

from argparse import ArgumentParser, ArgumentError

from argparse import RawDescriptionHelpFormatter

from progress.bar import ShadyBar as KamakiProgressBar

log = getLogger(__name__)

class Argument(object):

    """An argument that can be parsed from command line or otherwise.

    This is the top-level Argument class. It is suggested to extent this

    class into more specific argument types.

    """

    def __init__(self, arity, help=None, parsed_name=None, default=None):

        self.arity = int(arity)

        self.help = '%s' % help or ''

        assert parsed_name, 'No parsed name for argument %s' % self

        self.parsed_name = list(parsed_name) if isinstance(

            parsed_name, list) or isinstance(parsed_name, tuple) else (

                '%s' % parsed_name).split()

        for name in self.parsed_name:

            assert name.count(' ') == 0, '%s: Invalid parse name "%s"' % (

                self, name)

            msg = '%s: Invalid parse name "%s" should start with a "-"' % (

                    self, name)

            assert name.startswith('-'), msg

        self.default = default or (None if self.arity else False)

    @property

    def value(self):

        return getattr(self, '_value', self.default)

    @value.setter

    def value(self, newvalue):

        self._value = newvalue

    def update_parser(self, parser, name):

        """Update argument parser with self info"""

        action = 'append' if self.arity < 0 else (

            'store' if self.arity else 'store_true')

        parser.add_argument(

            *self.parsed_name,

            dest=name, action=action, default=self.default, help=self.help)

class ConfigArgument(Argument):

    """Manage a kamaki configuration (file)"""

    def __init__(self, help, parsed_name=('-c', '--config')):

        super(ConfigArgument, self).__init__(1, help, parsed_name, None)

        self.file_path = None

    @property

    def value(self):

        return super(ConfigArgument, self).value

    @value.setter

    def value(self, config_file):

        if config_file:

            self._value = Config(config_file)

            self.file_path = config_file

        elif self.file_path:

            self._value = Config(self.file_path)

        else:

            self._value = Config()

    def get(self, group, term):

        """Get a configuration setting from the Config object"""

        return self.value.get(group, term)

    @property

    def groups(self):

        suffix = '_cli'

        slen = len(suffix)

        return [term[:-slen] for term in self.value.keys('global') if (

            term.endswith(suffix))]

    @property

    def cli_specs(self):

        suffix = '_cli'

        slen = len(suffix)

        return [(k[:-slen], v) for k, v in self.value.items('global') if (

            k.endswith(suffix))]

    def get_global(self, option):

        return self.value.get_global(option)

    def get_cloud(self, cloud, option):

        return self.value.get_cloud(cloud, option)

_config_arg = ConfigArgument('Path to config file')

class RuntimeConfigArgument(Argument):

    """Set a run-time setting option (not persistent)"""

    def __init__(self, config_arg, help='', parsed_name=None, default=None):

        super(self.__class__, self).__init__(1, help, parsed_name, default)

        self._config_arg = config_arg

    @property

    def value(self):

        return super(RuntimeConfigArgument, self).value

    @value.setter

    def value(self, options):

        if options == self.default:

            return

        if not isinstance(options, list):

            options = ['%s' % options]

        for option in options:

            keypath, sep, val = option.partition('=')

            if not sep:

                raiseCLIError(

                    CLISyntaxError('Argument Syntax Error '),

                    details=[

                        '%s is missing a "="',

                        ' (usage: -o section.key=val)' % option])

            section, sep, key = keypath.partition('.')

        if not sep:

            key = section

            section = 'global'

        self._config_arg.value.override(

            section.strip(),

            key.strip(),

            val.strip())

class FlagArgument(Argument):

    """

    :value: true if set, false otherwise

    """

    def __init__(self, help='', parsed_name=None, default=False):

        super(FlagArgument, self).__init__(0, help, parsed_name, default)

class ValueArgument(Argument):

    """

    :value type: string

    :value returns: given value or default

    """

    def __init__(self, help='', parsed_name=None, default=None):

        super(ValueArgument, self).__init__(1, help, parsed_name, default)

class CommaSeparatedListArgument(ValueArgument):

    """

    :value type: string

    :value returns: list of the comma separated values

    """

    @property

    def value(self):

        return self._value or list()

    @value.setter

    def value(self, newvalue):

        self._value = newvalue.split(',') if newvalue else list()

class IntArgument(ValueArgument):

    @property

    def value(self):

        """integer (type checking)"""

        return getattr(self, '_value', self.default)

    @value.setter

    def value(self, newvalue):

        try:

            self._value = self.default if (

                newvalue == self.default) else int(newvalue)

        except ValueError:

            raiseCLIError(CLISyntaxError(

                'IntArgument Error',

                details=['Value %s not an int' % newvalue]))

class DateArgument(ValueArgument):

    DATE_FORMAT = '%a %b %d %H:%M:%S %Y'

    INPUT_FORMATS = [DATE_FORMAT, '%d-%m-%Y', '%H:%M:%S %d-%m-%Y']

    @property

    def timestamp(self):

        v = getattr(self, '_value', self.default)

        return mktime(v.timetuple()) if v else None

    @property

    def formated(self):

        v = getattr(self, '_value', self.default)

        return v.strftime(self.DATE_FORMAT) if v else None

    @property

    def value(self):

        return self.timestamp

    @value.setter

    def value(self, newvalue):

        self._value = self.format_date(newvalue) if newvalue else self.default

    def format_date(self, datestr):

        for format in self.INPUT_FORMATS:

            try:

                t = dtm.strptime(datestr, format)

            except ValueError:

                continue

            return t  # .strftime(self.DATE_FORMAT)

        raiseCLIError(None, 'Date Argument Error', details=[

            '%s not a valid date' % datestr,

            'Correct formats:\n\t%s' % self.INPUT_FORMATS])

class VersionArgument(FlagArgument):

    """A flag argument with that prints current version"""

    @property

    def value(self):

        """bool"""

        return super(self.__class__, self).value

    @value.setter

    def value(self, newvalue):

        self._value = newvalue

        if newvalue:

            import kamaki

            print('kamaki %s' % kamaki.__version__)

class KeyValueArgument(Argument):

    """A Value Argument that can be repeated

    :syntax: --<arg> key1=value1 --<arg> key2=value2 ...

    """

    def __init__(self, help='', parsed_name=None, default={}):

        super(KeyValueArgument, self).__init__(-1, help, parsed_name, default)

    @property

    def value(self):

        """

        :returns: (dict) {key1: val1, key2: val2, ...}

        """

        return super(KeyValueArgument, self).value

    @value.setter

    def value(self, keyvalue_pairs):

        """

        :param keyvalue_pairs: (str) ['key1=val1', 'key2=val2', ...]

        """

        self._value = {}

        for pair in keyvalue_pairs:

            key, sep, val = pair.partition('=')

            if not sep:

                raiseCLIError(

                    CLISyntaxError('Argument syntax error '),

                    details='%s is missing a "=" (usage: key1=val1 )\n' % pair)

            self._value[key] = val

class ProgressBarArgument(FlagArgument):

    """Manage a progress bar"""

    def __init__(self, help='', parsed_name='', default=True):

        self.suffix = '%(percent)d%%'

        super(ProgressBarArgument, self).__init__(help, parsed_name, default)

    def clone(self):

        """Get a modifiable copy of this bar"""

        newarg = ProgressBarArgument(

            self.help, self.parsed_name, self.default)

        newarg._value = self._value

        return newarg

    def get_generator(self, message, message_len=25):

        """Get a generator to handle progress of the bar (gen.next())"""

        if self.value:

            return None

        try:

            self.bar = KamakiProgressBar()

        except NameError:

            self.value = None

            return self.value

        self.bar.message = message.ljust(message_len)

        self.bar.suffix = '%(percent)d%% - %(eta)ds'

        self.bar.start()

        def progress_gen(n):

            for i in self.bar.iter(range(int(n))):

                yield

            yield

        return progress_gen

    def finish(self):

        """Stop progress bar, return terminal cursor to user"""

        if self.value:

            return

        mybar = getattr(self, 'bar', None)

        if mybar:

            mybar.finish()

_arguments = dict(

    config=_config_arg,

    cloud=ValueArgument('Chose a cloud to connect to', ('--cloud')),

    help=Argument(0, 'Show help message', ('-h', '--help')),

    debug=FlagArgument('Include debug output', ('-d', '--debug')),

    include=FlagArgument(

        'Include raw connection data in the output', ('-i', '--include')),

    silent=FlagArgument('Do not output anything', ('-s', '--silent')),

    verbose=FlagArgument('More info at response', ('-v', '--verbose')),

    version=VersionArgument('Print current version', ('-V', '--version')),

    options=RuntimeConfigArgument(

        _config_arg, 'Override a config value', ('-o', '--options'))

)

#  Initial command line interface arguments

class ArgumentParseManager(object):

    """Manage (initialize and update) an ArgumentParser object"""

    parser = None

    _arguments = {}

    _parser_modified = False

    _parsed = None

    _unparsed = None

    def __init__(self, exe, arguments=None):

        """

        :param exe: (str) the basic command (e.g. 'kamaki')

        :param arguments: (dict) if given, overrides the global _argument as

            the parsers arguments specification

        """

        self.parser = ArgumentParser(

            add_help=False, formatter_class=RawDescriptionHelpFormatter)

        self.syntax = '%s <cmd_group> [<cmd_subbroup> ...] <cmd>' % exe

        if arguments:

            self.arguments = arguments

        else:

            global _arguments

            self.arguments = _arguments

        self.parse()

    @property

    def syntax(self):

        """The command syntax (useful for help messages, descriptions, etc)"""

        return self.parser.prog

    @syntax.setter

    def syntax(self, new_syntax):

        self.parser.prog = new_syntax

    @property

    def arguments(self):

        """(dict) arguments the parser should be aware of"""

        return self._arguments

    @arguments.setter

    def arguments(self, new_arguments):

        if new_arguments:

            assert isinstance(new_arguments, dict)

        self._arguments = new_arguments

        self.update_parser()

    @property

    def parsed(self):

        """(Namespace) parser-matched terms"""

        if self._parser_modified:

            self.parse()

        return self._parsed

    @property

    def unparsed(self):

        """(list) parser-unmatched terms"""

        if self._parser_modified:

            self.parse()

        return self._unparsed

    def update_parser(self, arguments=None):

        """Load argument specifications to parser

        :param arguments: if not given, update self.arguments instead

        """

        if not arguments:

            arguments = self._arguments

        for name, arg in arguments.items():

            try:

                arg.update_parser(self.parser, name)

                self._parser_modified = True

            except ArgumentError:

                pass

    def update_arguments(self, new_arguments):

        """Add to / update existing arguments

        :param new_arguments: (dict)

        """

        if new_arguments:

            assert isinstance(new_arguments, dict)

            self._arguments.update(new_arguments)

            self.update_parser()

    def parse(self, new_args=None):

        """Parse user input"""

        try:

            pkargs = (new_args,) if new_args else ()

            self._parsed, unparsed = self.parser.parse_known_args(*pkargs)

        except SystemExit:

            raiseCLIError(CLISyntaxError('Argument Syntax Error'))

        for name, arg in self.arguments.items():

            arg.value = getattr(self._parsed, name, arg.default)

        self._unparsed = []

        for term in unparsed:

            self._unparsed += split_input(' \'%s\' ' % term)

        self._parser_modified = False